Paper 2016/125 Original: eprint.iacr.org/2016/125 ↗
Compact Identity Based Encryption from LWE
Abstract
We construct an identity-based encryption (IBE) scheme from the standard Learning with Errors (LWE) assumption that has \emph{compact} public-key and achieves adaptive security in the standard model. In particular, our scheme only needs 2 public matrices to support $O(\log^2 \secparam)$-bit length identity, and $O(\secparam / \log^2 \secparam)$ public matrices to support $\secparam$-bit length identity. This improves over previous IBE schemes from lattices substantially. Additionally, our techniques from IBE can be adapted to construct a compact digital signature scheme, which achieves existential unforgeability under the standard Short Integer Solution (SIS) assumption with small polynomial parameters.
Metadata
- Available format(s)
PDF- Category
- Public-key cryptography
- Publication info
- Preprint.
- History
- 2016-10-10: last updated
- 2016-02-14: published
- Short URL
- https://ia.cr/2016/125
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2016/125,
author = {Daniel Apon and Xiong Fan and Feng-Hao Liu},
title = {Compact Identity Based Encryption from LWE},
howpublished = {Cryptology {ePrint} Archive, Paper 2016/125},
year = {2016},
url = {https://eprint.iacr.org/2016/125}
}